Update .gitlab-ci.yml

.gitlab-ci.yml

 image: alpine:latest
 
+stages:
+    - deploy
+  
 pages:
   stage: deploy
   script:
-  - echo "Deploying to https://transfer.hft-stuttgart.de/pages/$CI_PROJECT_PATH/"
+    - echo "deploy to https://transfer.hft-stuttgart.de/pages/$CI_PROJECT_PATH/"
   artifacts:
     paths:
-    - public
-  only:
-  - master
+      - public
+  only: 
+    - master
+